<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <style>
            *{
                margin: 0px;
                padding: 0px;
                list-style: none;
            }
            textarea{
                width: 700px;
                margin: 20px auto;
                display: block;
                resize: none;
                outline: none;
            }
            button{
                width: 700px;
                margin: 20px auto;
                display: block;
                background-color: blue;
                border: none;
                outline: none;
                line-height: 40px;
                cursor: pointer;
                color: white;
            }
            ul{
                width: 700px;
                margin: 0px auto;
            }
            ul>li{
                background-color: orange;
                margin-bottom: 10px;
                position: relative;
                padding: 5px;
            }
            span{
                position: absolute;
                right: -5px;
                top: -5px;
                cursor: pointer;
            }
        </style>
    </head>
    <body>
        <textarea name="" id="txt" cols="30" rows="10"></textarea>
        <button id="btn">发布</button>
        <ul id="box">
            <li>
                1234567
                <p>2021-06-10</p>
                <span onclick="del(this)">X</span>
            </li>
        </ul>
    </body>
    
    <script>
        btn.onclick=function(){
            if(txt.value==''){
                alert('请输入内容')
            }else{
                var d=new Date();
                console.log(d)
                var year=d.getFullYear();
                var month=d.getMonth()+1
                var date=d.getDate()
                var val=txt.value;
                var tag=document.createElement('li');
                tag.innerHTML=`${val}
                <p>${year}-${month}-${date}</p>
                <span  onclick="del(this)">X</span>`
                box.appendChild(tag);
                txt.value=''
            }
        }
        function del(a){
            a.parentNode.parentNode.removeChild(a.parentNode)
        }
    </script>
</html>